Paper-feed pressure device for typewriting machines



A. UTZ.

PAPER FEED PRESSURE DEVICE FOR TYPEWRITING MACHINES.

APPLICATION FII:ED 050.3, 1921. 2

1,428,569. v PatentdSept.12, 1922.,

unmwiilll Ilium,

Patented Sept. 12, 1922.

ANTHONY UTZ, or HARTFORD, CONNECTICUT, ASSiIGNOR T0 ROYAL rrrnwmrnn COMPANY, 11m, or NEW YORK, N. Y., A. oonroaarron OFCALIFORNIA.

PAEEB-EEED IPBESSUBE: DEVICE FOR TYPEWBITING MACHINES.

Application filed. December a, 1921. Serial No. 519,642.

T 0 all whom it may concern:

Be it known that I, ANTHONY U'rz, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Paper-Feed Pressure Devices for Typewriti'ng Machines, of which the following is a specification.

This invention relates to devices employed for feeding paper to the printing point on the rotary platen of a front strike, visible typewriting machine, and more particularly to the pressure rolls which normally bear on the lower portion of the platen or on the paper carried thereby, and exert acertain amount of pressure thereon.

Various kinds of mechanism have heretofore beenemployed for this purpose. Those heretofore used in the standard Royal machines are well illustrated in United States Patents Nos. 1,100,301; 1,270,292 and 1,27 0,97 9. Generally stated, such paper feed mechanism comprises front and rear rolls which extend through a paper guide and are mounted to turn in pivotally mounted supporting arms which are spring pressed in such manner as to hold the rolls yieldingly against the platen. Heretofore'the springs employed for thus holding the feed rolls against the platen have. been. in the form of coiled springs surrounding the rods which support the roller carrying arms or in the form of leaf springs, which bear on the arms, but in such constructions no eflicient means has been provided for giving a fine or delicate adjustment to the springs and provision was not made for efiiciently distributing the pressure exerted by the front rolls or for conveniently adjusting such pressure. I

According to my present invention I provide devices which are readily accessible and which can give a very delicate adjustment to the rolls without exerting undue strain on other parts of the mechanism. A single rod is employed for supporting a plurality of front feed rolls, but I use a separate sup-' porting arm for each front pressure roll and a separate spring and separate adjusting'device for each such roll. A supporting arm of each frontroll is connected by an extension spring to a pivoted or rocking support which is engaged'by an adjusting screw carried by the carriage rail andwithin easy reach of the operator for adjustment. purposes. Each front roll is carried by arms which are fixed to a short rock shaft formed with a collar to which the arm is attached and whichis mounted in bearings in the carnage rall whlch is suitably recessed or cut away to receive the shaft and the collar and is so formed as to prevent endwise move- -ment of the shaft and arm in the bearings.

The short rock shafts are held in place by cap plates attached to the carriage rail and these capsin some cases are employed to hold the rocking supports for the springs in place.

In the accompanying drawings Figure l is a vertical section of portions of a typewriting machine employing my improvements. I V

Figure 2 is a top plan view of the mechanism shown in Figure 1 with some parts omitted in order to more clearly show other parts. v

Figure 3 is a detail view in section on the line 33 of Figure 2.

Figure 4 is an enlarged sectional view showlng more in detail the manner in which the supports for the inner ends of the springs of the front rolls are mounted.

Figure 5 is a detail sectional view showing a modified way of supporting the inner end of a front roll spring. i

Figure 6 is a detail view in section on the l1ne 66 of Figure 1, and illustrates the wayin which the rock shafts of the front roll arms are supported. A rotary platen is indicated at A, and B indicates part of one of the side plates of the carnage. Part of the paper table is shown at C and D indicates the paper guide extend mg from the lower edge of the table below the platen and'to the front portion thereof. The parts just mentioned are of usual'construction. The rear pressure roll E extends from one end of the platen'to the other and it is supported in arms F pivoted to the side frame B at f and engaged by a spring 7" which tends to move the roll toward the platen. The arms F areexten'ded as indicated at f and are engaged by a rock shaft G recessed at g to receive the extensions 7. All of this mechanism is similar to that shownin the patents before mentioned. The

'rock shaft G may be turned or adjusted by supported on a single bar or rod mounted so that the pressure of each roll may be independently adjusted. These rolls are supported in bearings on arms J extending upwardly and forwardly from short rock shafts K (Figure 6) mounted i n bearings formed in the carriage rail L. As shown in Figure 6, open bearings are provided for the shafts K and recesses Z are formed to receive the arms J and also receive the collars formed on the shafts, the construction being such that endwise movement of the shafts in their bearings'is prevented while the shafts are held against vertical movement by cap plates M which bridge the shafts (Figure 3) and are held in place by screws m. The cap plates also performanother function hereinafter described. The arms J are prolonged rearwardly beyond the shafts K as indicated at N and these extensions enter recesses g in the rock shaft G in the manner described in said before mentioned patents. lVhen the arm extensions N and f are in the re'eessesg, g, the front and rear pressure rolls engage the platen. The rolls are yieldingly held against the platen by the improved devices shown in the drawings. One arm J of each set of front roll supporting arms is connected by a horizontally arranged extension spring O with a verticallyarranged'support, which as shown in Figures 1 to 4, inclusive,comprises an upwardly extending member P pivotally mounted at the lower end and engaged between its' upper and lower ends by an adjustment screw Q.

In Figures 1 to f inclusive, the support P is made in the' form of a crank, the vertical arm of which connects with a horizontally arranged part p which is formed with an annular recess 79 and lies in a bearing made in the carriage rail L. The cap plate M is provided with a downwardly extending portion m which enters the recess in the crank and holds the crank in place, preventing vertical or endwise movement thereof.

Figure 4: of the drawings shows a bend in the crank at This is merely for the purpose of clearing other parts of the typewriting mechanism not shown in the drawings. Each adjustment screw Q is secured in a tapped opening in the rail L, its kerfed front end being readily accessible for adjustmentpurposes. By these devices each front roll is held with yielding pressure against the platen by devices which do not exert a downward pressure on the ball race R, which is interposed between the carriage rail L and.

the shift rail S.- By means of the adjusting screws, the'short rock shafts P may be given a very fine and delicate adjustment to suit varying conditions.

Instead of employing cranks to support the rear ends of the springs O, I may employ vertical rocking plates T (Fig. 5), the lower platen.

ends of which are seated in recesses Z in the carriage rail L, while the upper ends are connected with the rear ends of the springs O. The adjustment screws Q in this instance are formed with reduced portions 0 which extend through holes 2? in the plates.

As shown in Figure l, the carriage rail L is formed with a front downwardly extending flange Z which is for the purpose of strengthening the rail and partially covering the ball bearings. The rails L and S are held in proper relation by connecting devices U of well known construction. H

The devices employed for turning or adj usting the rock shaft have not been illustrated. They may be ofstandard construction. As before stated, preferably the rear roll E extends from end to end of the platen as usual and as usual, a plurality of front pressure rolls is used. The drawings indicate the manner of supporting one of the front rolls. It is to be understood that the others are supported in a similar way.

Referring to crank P shown particularly in Figures 4c and 2, it will be seen that it is bent at P so as to allow the pull'of the spring 0 in as near the same plane as the arm J rocks in, thus eliminating as much as possible any chances of side bind or strain I claim as my invention:

1. The combination with a rotary platen of paper feed pressure devicescomprising a plurality of front pressure rolls, a supporting arm for each pressure roll, a short rock shaft on which each arm is supported, means for preventing endwise movement of the shafts and the arms, and means for holding the rolls with yielding pressure against the 2. The combination with a rotary platen .of paper feed pressure devices comprising front feed pressure rolls, a supporting arm for each feed roll, a short. shaft having a collar on which each arm is mounted, bearings for the shafts having recessed portions into whichthe arms and the collars extend, and means for holding the rolls with a yield ing pressure against, the platen.-

3. The combination with a rotary platen, of paper feed pressure devices, comprising a pressure device, a pivoted arm supporting the same, a springconnected atone end to said pivoted .arm, a pivoted support for the opposite end of the spring, and means for adjusting the support to vary the tension of the spring.

4s; The combination with a rotary platen ofpaper-feedpressure devices, comprising a pressure device engaging the platen, anarm supporting said device, a spring connected with said arm, a pivoted support for the op posite end of the spring, and means for moving the support about its pivot to vary the pressure of the pressure device on the platen.

5. The combination with a rotary platen, of paper feed pressure devices comprising a front feed pressure roll, arms in which it is supported, a horizontally arranged extension spring attached to one of the arms, a pivoted support for the opposite end of the spring, and a set screw for moving. the support about its pivot to vary the tension of the spring.

6. The combination with a rotary platen, of paper feed pressure devices comprising a pressure roll, supporting arms therefor, a spring connected with one of said arms, a pivoted support for the opposite end of said spring mounted in the carriage rail, and an adjustment screw carried by the carriage rail and engaging said support.

7. The combination with a rotary platen, of paper feed pressure devices comprising a pressure roll engaging the platen, a supporting arm therefor, a horizontally arranged extension spring having one end engaging said arm. a cranked support to which the opposite end of the spring is attached, and means for holding the cranked support in place.

8. The combination with a rotary platen, of paper feed pressure devices comprising a pressure roll engaging the platen, a supporting arm therefor, a cranked support having bearings in the carriage rail, means for holding the support in place, and a horizontally arranged extension spring having its ends engaging the supporting arm and the cranked support respectively.

9. The combination with a rotary platen, of paper feed pressure devices comprising a pressure roll engaging the platen, a supporting arm therefor, a cranked support having bearings in the carriage rail, means for holding the support in place, a horizontally arranged extension spring having its ends engaging the supporting arm and the cranked support respectively, and means for adjusting the cranked support to vary the tension of the spring and consequently the pressure of the roll against the platen.

10. The combination with a rotary platen, of paper feed pressure devices comprising a pressureroll, a pivoted support therefor, a pivoted spring support, a single means for holding both said supports in position, a spring interposed between the roll support and the spring support for holding the roll yieldably against the platen, and means for adjusting the spring support to vary the tension of the spring.

In testimony whereof, I have hereunto subscribed my name.

ANTHONY UTZ.

Certificate of Correctiom It is hereby certified that the State of incorporation of the assignee in Letters Patent No, 1,428,569, granted September 12, 1922, upon the application of Anthony Utz, of Hartford, Connecticut, for an improvement. in Paper-Feed Pressure Devices for Typewriting Machines, Was erroneously given as California, Whereas said State should have been given as New York, as shown by the record of assignments in this office; and that the said Letters Patent should be read With this correction therein that the same may conform to the record of the case in the Patent Office. 1.

Signed and sealed this 10th day of October, A. D., 1922.

[SEAL] WM. A. KINNAN,

Assistant Commissioner of Patents. 

